Complaints about itching, rashes, headaches and hives surfaced within the first few weeks of the uniform roll-out. American launched an investigation, initially saying that it thought the issues were isolated – possibly some sort of wool allergy.

But the airline’s flight attendants say the problem has become widespread, "including (for) many ... who are quite pleased with the look of the uniform."

In a memo to its members late Wednesday, the Association of Professional Flight Attendants (APFA) said “we have received over 1,600 flight attendant reports of suspected uniform reactions that include headaches, rashes, hives, burning skin and eye irritation, itching, and respiratory problems — to name a few.”

“The growing number of reports of suspected reactions, triggered by both direct and indirect contact with the uniform, has prompted APFA to ask that all uniforms be recalled until further joint testing with the company can be completed,” the union said.

American Airlines spokesman Ron DeFeo told The Dallas Morning News that the carrier has already done three rounds of testing but that – so far – all results have been “in line with normal standards.”

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American Airlines flight attendants say their new uniforms are making them sick.

DeFeo added to the Star-Telegram of Fort Worth that the airline has permitted about 200 attendants to continue wearing their old uniforms. It also has ordered 600 non-wool versions of the new uniforms in the hope of alleviating some of the reactions.

Another round of testing is planned in conjunction with the union. However, the attendants group says at this point, “a remedy that excludes a full recall of the uniform fails to adequately protect our members.”

“To that end, APFA will continue to explore all legal options and consult with additional experts in the field to better understand the results of our ongoing independent testing as well as joint testing moving forward,” the union added in its memo.

As for where the uniforms are made, the Chicago Business Journal writes "plants in no fewer than five countries were involved in making the new American Airlines' uniforms worn by flight attendants."

A US Airways aircraft painted in the colors of the Arizona Cardinals NFL team is seen in Phoenix on Oct. 7, 2011. The plane is one of several that the airline painted in the colors of pro football teams. Tom Tingle, The Arizona Republic

Charles Alford, a US Airways customer service worker from Raleigh/Durham, proudly shows off his boarding pass to be on the last-ever US Airways flight on Oct. 16, 2015, in San Francisco. Ben Mutzabaugh, USA TODAY